Mm, I wondered about a link between religious fundamentalism and AS, primarily because I thought they would be mutually exclusive - few religions being particularly logical, and usually requiring a "it just is" belief at some point along the road.
However, I've since met someone that displays a lot of aspie traits, although I wouldn't presume she is, I suspect she is. She is also a fundamentalist Christian of some branch or another (creationist, that's pretty fundamentalist isn't it?) She does, however, try to explain things in a logical fashion, but the holes in the arguements are HUGE, and theyr'e ususally pretty circular arguments aswell. (Aswell as: God exists even though you can't see him. You can't see the wind, can you? But you feel it's effects. Well then, that proves God exists.)
So maybe it's like many other things. Who you're raised by, how much you're encourages to enquire at an early age or conversely how much religious indoctrination you go through and discouragement from enquiry. (As is this girl's case, I suspect)